RegeneratorRuntime is not defined

Question

I am trying to run Karma-babel-preprocessor and a straight forward ES6 generator:

//require(\'babel/polyfill\');

  describe(\"how Generators work\", functio         


        

Answer 1

If you use React, adding polyfills from create-react-app worked for me.

yarn add --dev react-app-polyfill

Then add the following lines to webpack.config.js

entry: {
  app: [
    'react-app-polyfill/ie9', // Only if you want to support IE 9
    'react-app-polyfill/stable',
    './src/index.jsx',
  ],
},

See more examples on the react-app-polyfill GitHub page.